Fluid ester gum composition



Patented Apr. 18, 1939 2,15

UNITED STATES PATENT OFFICE FLUID ESTER GUM COMPOSITION Herbert A. Winkelmann, Chicago, and James P. McKenzie, Evanston, Ill., assignors to Marbon Corporation, Chicago, 111., a corporation of Delaware No Drawing. Application October 31, 1936, Serial No. 108,681

2 Claims. (Cl. 13417) This invention relates to a new composition of or partially saturated rubber hydrochlorides may matter and relates particularly to compositions be used but for most purposes, including molded containing rubber hydrohalides and fluid ester products and'lacquers the substantially saturated gums. rubber hydrochlorides are most suitable. For

An object of this invention is to provide an imliquid compositions a low viscosity product ob- 5 proved clear adhesive. tained by milling rubber hydrochloride in the Another object is to provide a lacquer particupresence of a stabilizer is of advantage. larly adapted for coating on rubber and other Likewise, the proportions and type of solvent flexible surfaces. used to dissolve the rubber hydrochloride-ester A further object is to provide a homogenizing gum composition may vary. In general benzol agent for use with rubber hydrochloride compoand its homologues are most suitable. However,

sitions during milling. chlorinated solvents such as ethylene dichloride, Another object is to provide improved plasticarbon tetrachloride and tetrachlorethane may cized rubber hydrochloride compositions. be used; also hydrogenated naphthas are of value,

Other objects will become apparent on reading particularly when used in conjunction with other the specification and appended claims, solvents. Acetone may be used as a diluent and We have discovered that the fluid ester gums to reduce the viscosity of the coating solutions.

such as methyl abietate, ethyl abietate, hydro- The following examples will illustrate our invengenated methyl abietate, and hydrogenated ethyl tionr abietate are compatible with rubber hydrochloride Example I in all proportions, dissolve in mutual solvents TWO f nula for a Coating composition, palm with rubber hydrochlorides to form clear soluticulafly adapted for coating on flexibl rubber tions and act as plasticizers for rubber hydrourf are as follows;

chlorides. Furthermore, the fluid ester gum may be incorporated in rubber and the mixture re- No.2 acted with hydrogen chloride to obtain an intimate mixture of rubber hydrochloride and ester Amorphous rubber hydrochloride gum. Stabilizers and fillers may be incorporated Hydrogenated methyl abietate .I With this mixture by fluxing it on a mill or in any gmgq naphtha agitator mixer under positive pressure. The ester gum acts as a homogenizer and plasticizer allowing the incorporation of materials in this manner Example much more readily than if it is not present. 301111310 of Clear zfdheslves were D epaled The proportion of fluid ester gum to rubber accordmg to the followmg formulae:

hydrohalide may be varied widely depending on the characteristics desired and the use for the A C composition.

In the roduction of lear permanently tacky Milled, amorphous, stabihzed rubber hydroadhesives the fluid ester gum is used in such prochloride: 600 portions that the tacky adhesive quality of the fluid ester gum is not overcome by the rubber hy- 1050 65 drochloride. In general, the preferred permanently tacky adhesives W111 contain from about 531$.3%?81ii;assent:::::::::::::::::::: i323; it??? 1 to 3 parts by Weight of ester gum per one part n y weight f ubber hydrochloride. For hard The compositions can be used, if kept at room setting adhesives and for lacquers the fluid ester temperature or above without fear of elation gum is used in lesser proportions so that the non They give a clear, strong adhesive. Formula C tacky and hi tensile, tough p pe es of the gives a clear, permanently tacky adhesive, suitrubber hydrochloride will predominate. The able for masking tape and as a general purpose type of rubber hydrochloride may vary. Howadhesive. Formula A gives a clear, hard setting so ever, for liquid coating compositions we prefer adhesive. It is understood that the above forto use the permanently amorphous or soluble type mulae are merely illustrative. Hydrogenated rubber hydrochloride since the crystalline type ethyl abietate, ethyl abietate and hydrogenated rubber hydrochloride will gel in concentrations methyl abietate may be used in place of methyl too low for most commercial purposes. Saturated abietate.

Example III A rapid drying, non-gelling, permanently tacky adhesive was prepared according to the following formula:

Milled stabilized amorphous rubber hydrochloride 100 Hydrogenated methyl abietate 200 Aetone 221 Benzol 221 Milled stabilized amorphous rubber hydrochloride 200 Hydrogenated methyl abietate 100 Rosin- 50 Acetone 350 Benzo 350 The above composition is useful as a general purpose adhesive, a household adhesive, waterproof glue for boots, waterproof gasket cements, etc.

We claim:

1. A fluid composition which on evaporation of its volatile liquid gives a permanently tacky adhesive, said composition consisting essentially of a dispersion in a volatile solvent of 1 part by weight of milled stabilized amorphous rubber hydrochloride and from 1 to 3 parts by weight of a fluid ester gum selected from the group consisting of alkyl and aralkyl esters of resin acids and monohydroxy alcohols.

2. A fluid composition which on evaporation of its volatile liquid gives a permanently tacky adhesive, said composition consisting essentially of a dispersion in a volatile solvent of 1 part by weight of milled stabilized amorphous rubber hydrochloride andap-proximately 2 parts by weight of methyl abietate.

HERBERT A. WINKELMANN.- JALAES P. MCKENZIE. 

